Wire Fusing Currrent Estimates for Copper, Iron, Aluminum, and
Tin

Wire fusing currents

These currents are estimates for how much
current it takes to melt a wire in free air. Of course anything that helps
dissipate or concentrate the heat, such as insulation, will change the wire
fusing current, so these are only estimates.

AWG

Diameter Inches

Diameter in mm

Fusing Current for Copper Wire (Amps)

Fusing current for Aluminum Wire (Amps)

Fusing Current for Iron Wire (Amps)

Fusing Current for Tin Wire (Amps)

OOOO

0.46

11.684

3196

2366

982

512

OOO

0.4096

10.40384

2685

1988

825

430

OO

0.3648

9.26592

2257

1671

693

362

0

0.3249

8.25246

1897

1404

582

304

1

0.2893

7.34822

1594

1180

489

255

2

0.2576

6.54304

1339

992

411

215

3

0.2294

5.82676

1125

833

345

180

4

0.2043

5.18922

945

700

290

152

5

0.1819

4.62026

794

588

244

127

6

0.162

4.1148

668

495

205

107

7

0.1443

3.66522

562

416

172

90.0

8

0.1285

3.2639

473

349

145

75.6

9

0.1144

2.90576

396

293

121

63.5

10

0.1019

2.58826

333

247

102

53.4

11

0.0907

2.30378

280

207

86

44.8

12

0.0808

2.05232

235

174

72.3

37.7

13

0.072

1.8288

198

147

60.8

31.7

14

0.0641

1.62814

166

123

51.0

26.7

15

0.0571

1.45034

140

103

42.9

22.4

16

0.0508

1.29032

117

86.7

36.0

18.8

17

0.0453

1.15062

99

73

30.3

15.8

18

0.0403

1.02362

82

61

25.4

13.3

19

0.0359

0.91186

69.6

52

21.4

11.2

20

0.032

0.8128

58.6

43.4

18.0

9.40

21

0.0285

0.7239

49.3

36.5

15.1

7.90

22

0.0254

0.64516

41.5

30.7

12.7

6.65

23

0.0226

0.57404

34.8

25.80

10.7

5.58

24

0.0201

0.51054

29.2

21.6

8.97

4.68

25

0.0179

0.45466

24.5

18.1

7.54

3.93

26

0.0159

0.40386

20.5

15.2

6.31

3.29

27

0.0142

0.36068

17.3

12.8

5.33

2.78

28

0.0126

0.32004

14.5

10.7

4.45

2.32

29

0.0113

0.28702

12.3

9.11

3.78

1.97

30

0.01

0.254

10.2

7.59

3.15

1.64

31

0.0089

0.22606

8.6

6.37

2.64

1.38

32

0.008

0.2032

7.3

5.43

7.31

1.17

Metric 2.0

0.00787

0.2

7.1

5.30

2.20

1.15

33

0.0071

0.18034

6.1

4.54

5.45

0.98

Metric 1.8

0.00709

0.18

6.1

4.53

1.88

0.98

34

0.0063

0.16002

5.1

3.79

1.57

0.82

Metric 1.6

0.0063

0.16002

5.1

3.79

1.57

0.82

35

0.0056

0.14224

4.29

3.18

8.31

0.69

Metric 1.4

0.00551

0.14

4.19

3.10

1.29

0.67

36

0.005

0.127

3.62

2.68

6.45

0.58

Metric 1.25

0.00492

0.125

3.54

2.62

1.09

0.57

37

0.0045

0.1143

3.09

2.29

0.95

0.50

Metric 1.12

0.00441

0.112

3.00

2.22

0.92

0.48

38

0.004

0.1016

2.59

1.92

9.31

0.42

Metric 1

0.00394

0.1

2.53

1.88

0.78

0.41

39

0.0035

0.0889

2.12

1.57

7.45

0.34

40

0.0031

0.07874

1.77

1.31

0.54

0.28

This chart of Fusing Currents for American Wire Gauge (AWG)
wire sizes is data intended for the pleasure of our readers only. Typographical
errors, etc. are probable, since the typist is not a professional (our CEO).
Please point out errors. The data listed are incomplete and should be used as a
guideline only. Please contact manufacturers for the latest data.

We hope that this information is helpful. Now go
out and design something that needs a charger, power supply, or battery
pack!